Greenlighting is when a male or female (often bisexual) will wear a green shirt, either polo or otherwise, and "pop" or pull their collar up. This marks them as being ready for sex with anyone who chooses them, be it male or female, they are "collared" when someone approaches them and pulls their collar down. This leads to sexual intercourse in most cases or sodomy when both partners are male. The trend is thought to have started in the gay community but quickly spread throught out 2004, with more communities meeting up in real life, and sharing stories online, the term can also be found online on the "Urban Dictionary". Many women who "collar" males see it as a chance for no strings attached sex whilst guys enjoy it for obvious reasons, in gay circles it is seen as a way of openly showing your true feelings. green Lighting shows that you are open to anything and many worry that this may lead to horrific abuse, and whilst this has yet to occur it may only be a matter of time.

when a male of female pops their collar up on a green shirt, it means they want sex. when someone pulls it down, they get it.

The act of popping one's collar on a green polo shirt to indicate that sex is wanted or needed. One who greenlights is called a greenlighter. This act can be done and recieved by either sex toward's either sex, and that is also the risk one takes when popping one's collar. The origin of this trend is unkown, but it quite popular. (A google search of greenlighter will show you the forums and other sites linked to this trend)

The usually-unconscious act of turning the object of one's romantic desires into a representation of some sort of ideal - a metaphorical "green light" shining across a bay. Often taken to the point where even if one were to successfully court that person, it would be unsatisfying as they would be humanly incapable of living up to the dreamlike figure they'd been built into.

A: Why won't Jay just talk to her if he likes her so much?

B: He's been totally green-lighting her. Even if he manages it, she's not the person he wants to think she is.

A useful peacock like fad where pop collared green shirt are used to signify sexual advances. The green lighters do not discriminate against strait and gay advances as they tend to be more in tune with swingers

man: drinking at a bar
partner looking for sex: do you green light?
man: Yes i do
PLFS: group, gay or straight.
Man: group

Thought to have been started in the UK by "chavs". A man will wear a green shirt with popped collar to show he is free for sex with anyone, be it a man or woman. Anyone willing to join him needs only to approach him and pop his collar down, claiming sexual rights to him. Started a few years ago and has spread slowly and is still largely unknown however many parent groups consider it dangerous and force strict clothing rules upon their kids as a result, as well as telling others to do the same!

I saw this kid at the club the other night with a green shirt and his collar popped up. An older dude came up to him and popped his collar back down, and then the two headed off towards the bathroom. They was green lighting.

(v.) Wearing a green polo shirt with the collar popped to signal that you would like to have, at the very least, oral sex. When someone accepts your silent proposition they simply walk up to you and turn your collar down (aka as collaring.

There was a girl at the club last night that was greenlighting so I collared her quick and we snuck to the bathroom.